Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for roofs and attics. See Department of Energy (DOE) ranges for recommended insulation levels below. In most climates, you'll save money and energy when you build a new home or if you install a combination of cavity insulation and insulating coating. Reduce leaks on exterior walls by taping the joints of the outer coating and sealing and sealing the outer walls.
Use tapes and adhesives designed for this application, as they must last for many years and are almost impossible to replace. Fibrous or cellulose insulation with cavities can be installed at levels up to R-15 on a 2 inch x 4 inch wall and up to R-21 on a 2 inch x 6 inch wall. R values may be higher for foam insulation and other advanced insulation systems. Insulation ratings are measured in R values per inch of thickness.
An R value indicates how well a type of insulation can prevent heat from leaving or entering your home. The R values for insulation vary depending on the type, thickness and density of the insulating material. Generally, a higher R insulation rating means better climate control and better energy efficiency for your home. A higher insulation value R generally also means a higher price.
The insulating material is measured in terms of its thermal resistance or R value: the higher the R value, the greater the insulation efficiency. The amount of insulation, or the R value, depends on the climate, the type of heating and cooling system, and the part of the house you plan to insulate. Depending on the type of insulation, you may need to arrange for installation by a professional contractor. To find out which products are best for insulating your home, we recommend that you talk to your local hardware store or home improvement store or a qualified contractor.
These help reduce energy that would otherwise be lost through the wood structure. The following table shows the recommended combinations. For more personalized recommendations, see Home Energy Saver. To better understand how well your home is sealed and insulated, consider participating in a home energy audit.
You can rent an insulating blowing machine to install this insulation yourself, but most choose to leave this installation in the hands of professionals. When it comes to the best insulation for walls, the insulating material can also affect the R values needed for good energy efficiency. To properly insulate a new home, you'll need to know where to insulate it and the recommended R values for each of those areas. There are several ways to properly insulate your home, depending on your budget and comfort level with projects related to home energy.
A home performance contractor can evaluate and determine the appropriate levels of insulation, air sealing and ventilation for your home. Because they have a high R value and can be used almost anywhere in the house, foam plate insulation is one of the most common types of insulation. Use the Home Energy Saver tool to determine where to insulate and the recommended R values depending on the climate, the type of heating and cooling system, etc. The most effective places to add insulation to older homes are exterior walls, attics, basements, and mezzanines.
Having your home well insulated is key to maintaining a comfortable temperature and your energy bills low. For example, in your attic, if your insulation is right at the level of the floor beams, or you can see the floor beams, you must evenly add and distribute more insulation. State and local building codes usually include minimum insulation requirements, but your energy efficient home is likely to exceed those requirements. You should consider radiant barriers for the attic or roof (in hot climates), reflective insulation, and foundation insulation for building a new home.